Abstract: The present invention relates to an adapter (1) for connecting a light to a track having mains phases and comprising a housing (2), at least one spring-loaded connector (6.1) linked to the housing (2), and a cover (4) partially covering the housing (2) and having at least one opening (8.1). The cover (4) is displaceable so as to be placed selectively in one of: a position in which the at least one spring-loaded connector (6.1) extends at least partially through the at least one opening (8.1), a position in which the cover (4) covers the at least one spring-loaded connector (6.1).

Abstract: A method of assembling a device including, taking a casing including a body having an opening and a lid for the opening, locating at least one electronic component within the body; locating a first end of a cable for electrically connecting the electronic component within the body to an external device, and deforming at least one of the body and the lid so as to secure the lid to the body and such that the cable is secured to the casing by the lid.

Abstract: A cover device for a case opening includes a coupled member, which is coupled to a case, and a cover, which includes a cover main body, a first screw fixing piece, and a second screw fixing piece. The cover main body includes a ceiling and a wall. The first screw fixing piece and the second screw fixing piece extend outward from different positions adjacent to the cover main body. The coupled member includes a plurality of projections. The projections include a first projection and a second projection that are located at opposite sides of a hypothetical line connecting screw holes of the first screw fixing piece and the second screw fixing piece. In a state in which the cover main body is covering the coupled member, the first projection and the second projection contact an inner surface of the wall in a direction orthogonal to the hypothetical line.

Abstract: An illustrative example embodiment of a connector includes a terminal configured to establish an electrically conductive connection with another component and a shroud surrounding the terminal. The shroud includes a first sidewall and a second sidewall that is transverse to the first sidewall. The first sidewall and the second sidewall have a sidewall dimension in a direction parallel to a longitudinal axis of the terminal. The shroud includes a first transition between the first sidewall and the second sidewall in the form of a hollow cylindrical sector having a first angular measurement of more than 90 degrees. The transition has a transition dimension that is less than the sidewall dimension.

Abstract: An electrical connector includes an insulative housing and a metallic shield attached thereupon. The housing forms a mating cavity recessed rearwardly and inwardly from a front face of the housing with a mating tongue extending therein. A plurality of contacts are disposed in the housing with corresponding contacting sections exposed upon the mating tongue facing toward the mating cavity. The metallic shield includes a front plate covering the front face of the housing with an opening aligned with the mating cavity, and an extension inwardly extending from an inner peripheral edge of the front plate around the opening, into the mating cavity and opposite to the mating tongue in the vertical direction.

Abstract: An electrical floor box is configured to be electrically connected to an electrical cable that includes a cable terminal. The electrical floor box includes a surface plate oriented parallel to a floor surface. The surface plate includes an aperture. The electrical floor box also includes an electrical connector positioned in the aperture of the surface plate. The electrical connector includes a connector terminal that is configured to engage the cable terminal to provide an electrical connection therebetween. The electrical floor box further includes a sealing member positioned between the electrical connector and the aperture of the surface plate. The sealing member is configured to engage a portion of the electrical cable to provide a water-tight seal between the electrical cable and the connector terminal while the electrical cable is coupled to the electrical connector.

Abstract: An artificial lighted tree may have power routed through the tree trunk and three-wire safety grounding. A system and method are provided for preventing inadvertent electrical connection of a standard plug to a female socket of an electrical power cord to the artificial lighted tree. The apparatus and method comprise a non-standard female socket on a three-prong safety grounded electrical power cord. The non-standard female socket includes raised side socket walls with vertical half rounds in the sidewalls to mate with a non-standard two-prong non-polarized male electrical plug, customized to include mating grooves cut into top and bottom lips. Advantageously, use of a non-standard female socket paired with a non-standard two-prong non-polarized male electrical plug functions to prevent electrical connection by standard two-prong non-polarized male electrical plugs thereby permitting use of a three wire cord having lower amperage rating than standard UL approved three wire cord.

Abstract: An electrical connector includes: a contact module having an insulative housing, two rows of terminals affixed to the insulative housing, and a metal shielding plate, the insulative housing comprising an annular receiving groove, a base portion located behind the annular receiving groove, and a tongue portion extending forwardly from the annular receiving groove, each terminal having a contacting portion exposed to a surface of the tongue portion, a soldering portion, and a connecting portion; an inner metal shell attached to the contact module; and an outer shell enclosing the inner metal shell; the connecting portion has an exposed portion located at a rear end of the connecting portion and suspended in the annular receiving groove, the annular receiving groove receives glue to form a sealer sealing between the contact module and the outer shell, and the exposed portion is embedded in the glue.

Abstract: A multifiber connector comprising a rectangular-shaped ferrule having a plurality of fibers, alignment structure positioned on a front face of the ferrule, the alignment structure being at least one of alignment pins and pin-receiving holes, a housing defining a ferrule opening, the ferrule opening sized and shaped to accommodate disposition of the ferrule therein, wherein when disposed within the ferrule opening the ferrule extends forward from a front face of the housing; the housing having an outer periphery, wherein the outer periphery is defined by at least a top wall, a bottom wall, and first and second side walls, each of the side walls defining a recess having a curved surface, each recess positioned at an intermediate point along the height of the first and second side walls, and a key on the outer periphery of the housing on at least one of the top wall and the bottom wall, the key being offset to one side of a centerline bisecting the connector into first and second side portions, wherein the key p

Abstract: A power connector assembly includes a connector housing and a plurality of receptacles defined in the connector housing. Each of the receptacles defines a keyed interface profile such that each interface profile is adapted to individually couple to a respective feeder connector. Each one of the receptacles has an interface profile different from the other interface profiles. The plurality of receptacles can include a first profiled interface, a second profiled interface and a third profiled interface. Each of the first, second and third profiled interfaces can define a longitudinal connector axis. The number of profile interfaces can be increased by selection of other angle positioned within the housing which prevent incorrect receptacles from be installed (i.e. connected).

Abstract: A laminated battery formed by laminating a plurality of flat cells each having an electrode tab includes: an insulating member disposed to prevent a short-circuit in the electrode tab; and a terminal connected to the electrode tab, wherein a tip end side of the terminal is supported by a support member provided on the insulating member.

Abstract: A crimp terminal (10) has a connecting portion (12) that is conductively connected to an electrical connection target, a crimp portion (14) that is fixed by crimping to a core (58) of a coated wire (56), and a link (16) extending between the connecting portion (12) and the crimp portion (14). The crimp portion (14) has a placement portion (36) on which the core (58) of the coated wire (56) is placed, and a core crimping portion (38) protruding from opposite edges of the placement portion (36). Extended portions (48) are provided on ends of the core crimping portions (38) toward the link (16) and at least one engaging corner (52) is formed on an upper end surface (50) of each of the extended portions (48).

Abstract: An electric power plug includes an insulative body having a first bar and a second bar at a space. The first bar is longitudinally formed with only one first channel for receiving a first plug terminal. The second bar is longitudinally formed with a plurality of second channels for receiving a plurality of second plug terminals. An electric power receptacle includes an insulative seat having a first trough for connecting the first bar and a second trough for connecting the second bar. The first and second troughs are arranged at a space. The first trough is provided with only one first receptacle terminal. The second trough is provided with a plurality of second receptacle terminals which are parallel with each other and arranged at a space.

Abstract: A high-amperage connector with visual alignment features is described. The connector can comprise a male connector with a male skirt where the male skirt has two keys on an outer surface. At least one of the keys on the outer surface of the male skirt can have an alignment feature. The connector also comprises a female connector with a female skin where the female skirt has two keyways on an inner surface of the female skirt. At least one of the keyways can have a corresponding alignment feature located on the outer surface of the female skirt. The alignment features on the male skirt and the female skirt allow a user to easily align the two connectors before connecting them.

Abstract: A magnetic repulsion-based coupler for an electrical connector includes a housing with two passages formed therein, a male terminal having a magnetic top on one of the passages, and a female terminal having a top made of a material attracted to a magnet in the other passage of the housing. Two such housings form an electrical connector for passing electric power from one conductor to another while preserving polarity when the couplers self-align. Self-alignment occurs when their opposing male terminals repel each other and are each attracted to the female terminals of the opposing couplers. Each passage in the housing of a coupler is formed to receive only the male or female terminal.

Abstract: A contact cover for a notification appliance mounting plate is disclosed. In one embodiment, the contact cover includes a plastic body, wherein the plastic body is sized to cover less than an entire surface area of the notification appliance mounting plate, at least one piece of metal, a means for coupling said at least one piece of metal to said plastic body and one or more polarized tabs.

Abstract: A power adapter includes a body, and a socket received in the body. The socket defines a first hole, a second hole and a third hole, and includes a live pin, a neutral pin and a ground pin respectively secured in the first hole, the second hole and the third hole. The live pin, the neutral pin and the ground pin are located along a straight line, and the neutral pin is located between the live pin and the ground pin.

Abstract: The invention relates to: a conductor line (2) for powering at least one device (11) that can travel along the conductor line (2), comprising a first elongated conductor lane (5b) and at least one other, second elongated conductor lane (6b), wherein the first (5b) and second (6b) conductor lanes comprise a first (5f) and a second (60f) contact opening, respectively, running along the length of the respective lane, for holding a part (15a; 16a) of a first (15) and a second (16) respective conductor contact of a collector (14) of the device (11); a collector (3) comprising at least one first conductor contact (15) provided for engaging into a first contact opening (5f) running along the length of a first conductor lane (5b) of the conductor line (2) and for electrically connecting to the first conductor lane (5b); and a conductor line system (1) formed therefrom.

Abstract: A plug and jack adapted to fit together with the plug releasably secured in the jack by detent means, so that plug electrical contacts carried by the plug are in electrical connection with jack electrical contacts carried by the jack, wherein spring means are provided which act between the plug and the jack to limit or eliminate movement of the secured plug relative to the jack.

Abstract: An ear plug apparatus using a 5-pole connection terminal is provided. The apparatus includes an ear plug and at least one connection terminal. The at least one connection terminal is attached to the ear plug. At least one connection terminal is positioned at an end of a body of the ear plug and isolates a space between one connection terminal and another connection terminal and includes at least one insulation pad attached to the ear plug.

Abstract: An electrical connector (100) for insertion of a first plug (800) along a mating direction. The electrical connector includes an insulative housing (1) and a contact module (3) assembled to the insulative housing. The insulative housing includes an opening (10), a receiving cavity (11) and a pair of blocking member (14) provided in the receiving cavity. The blocking member includes a guiding portion adjacent to the opening, and a resilient portion (141) projecting more inwardly to the receiving cavity along a transverse direction perpendicular to the mating direction than the guiding portion, to thereby form a shoulder portion (144) facing to the opening between the guiding portion and the resilient portion. The resilient portion is deformable sidewardly along the transverse direction.

Abstract: A hard disk assembly includes a first and a second hard disk, and a hard disk connecting mechanism for holding the first and the second hard disks. The first and second hard disks both each have a composite receptacle. The hard disk connecting mechanism includes a frame for mounting the first and the second hard disks and a composite connector detachably positioned in the frame. The composite connector includes a base, a first composite plug engaged with the composite receptacle of the first hard disk and a second composite plug engaged with the composite receptacle of the second hard disk.

Abstract: A hard disk assembly includes a first and a second hard disk, and a hard disk connecting mechanism for holding the first and the second hard disks. The first and second hard disks both each have a composite receptacle. The hard disk connecting mechanism includes a frame for mounting the first and the second hard disks and a composite connector detachably positioned in the frame. The composite connector includes a base, a first composite plug engaged with the composite receptacle of the first hard disk and a second composite plug engaged with the composite receptacle of the second hard disk. The frame defines a sliding slot. The base form a sliding protrusion slidably received in the sliding slot to slidably position the composite connector in the frame.

Abstract: A perimeter security system includes a barrier and a series of sensors. The sensors are connected together via connection cables that include pin-type engagement structure for connection with the sensors. The sensors may include a graduated sensory alert that changes as a person or object approaches. The pin-type connection arrangement includes a receiver having a passage for receiving an insert. The insert and a first end of the cable have matching cross-sections that enable the cable to be inserted within the receiver in a single orientation. A series of pins extend from the cable, and a pin contact arrangement is associated with the receiver. The insert may be one of at least a pair of differently configured inserts, each of which has a cross-section that matches only one end of the cable. Each insert includes an end wall, which includes a series of openings through which the pins extend.

Abstract: According to one embodiment, an electronic device includes: a main body; a switch; and a movement support portion. A component is detachably installed in a component installation portion of the main body. The switch includes a base and a movable portion. The switch becomes an ON state when the movable portion is moved relatively closer to the base. The movement support portion supports the switch so as to permit reciprocal movement of the switch along a direction in which the movable portion is moved closer to the base, and is moved to one of directions of the reciprocal movement by a predetermined ON operation. While the component is installed in the component installation portion, the switch becomes the ON state when the switch is sandwiched between the component and the movement support portion, and when the movable portion is moved relatively closer to the base.

Abstract: A USB connector for connecting with a USB female includes a rotating shaft assembly which is capable of rotating, metal legs, a connecting line, and a substrate. The rotating shaft assembly includes a rotating shaft, a rotating shaft sleeve and a rotating shaft support. The rotating shaft is disposed in the rotating shaft sleeve and is capable of rotating relative to the rotating shaft sleeve. The rotating shaft sleeve is located in a support hole of the rotating shaft support. The rotating shaft assembly with the rotating shaft support is fixed on the surface of the substrate by the rotating shaft support. The metal legs are formed on the surface of the substrate to ensure the connecting strength of the metal legs and reduce the thickness of the USB device.

Abstract: An exemplary electrical connector assembly includes an insert connector and a receiving connector. The insert connector includes a first pin and a second pin. The receiving connector defines a first and a second holes corresponding to the first and second pins of the insert connector, respectively. The first hole has a shape and a size matching the first pin, and the second hole has a shape and a size matching the second pin. The first and second pins of the insert connector are respectively extendable into and engagable in the first and second holes of the receiving connector. A transverse cross sectional area of the second pin is larger than that of the first pin, whereby the second pin of the insert connector is prevented from being received in the first through hole of the receiving connector.

Abstract: A circuit board connector includes a main body, first pins, and second pins. The main body is configured to be electrical connection to a circuit board and defines securing holes. Each first pin is straight. Each second pin is bent. The first pins and the second pins are secured in the securing holes.

Abstract: An exemplary electrical connector assembly includes an insert connector and a receiving connector. The insert connector includes a first pin and a second pin. The receiving connector defines a first and a second holes corresponding to the first and second pins of the insert connector, respectively. The first hole has a shape and a size matching the first pin, and the second hole has a shape and a size matching the second pin. The first and second pins of the insert connector are respectively extendable into and engagable in the first and second holes of the receiving connector. A transverse cross sectional area of the second pin is larger than that of the first pin, whereby the second pin of the insert connector is prevented from being received in the first through hole of the receiving connector.

Abstract: A connector is provided with a pair of female and male housings (10, 40) connectable with each other. The female housing (10) includes a block-shaped housing main body (11) and the male housing (40) includes a receptacle (42) having an inner surface shape conforming to outer surfaces of the housing main body (11). Corners on the outer surface of the housing main body diagonal to each other are bevels (14, 15) with different shapes. The bevels (14, 15) include moderately inclined portions (14) located at the opposite ends of the upper surface of the housing main body (11) and inclined at a relatively large angle with respect to a height direction and steeply inclined portions (15) located at the opposite ends of the lower surface of the housing main body (11) and inclined at a relatively small angle with respect to the height direction.

Abstract: An electrical connector is presented, including a plurality of connector wafers coupled by a coupling piece, each wafer including a housing accommodating a plurality of contact elements, said housing having opposite side edges, an insertion side exposing the contact elements, a back side and opposite main faces. The connector wafers are provided with first coupling means extending along at least a portion of a side edge thereof. The coupling piece is provided with second coupling means extending along at least a portion thereof. The first and second coupling means are arranged for engaging each other, in a coupled situation, on a plurality of distinct engagement positions along the respective coupling means.

Abstract: A circuit board connector includes a main body, first pins, and second pins. The main body is configured to be electrical connection to a circuit board and defines securing holes. Each first pin is straight. Each second pin is bent. The first pins and the second pins are secured in the securing holes.

Abstract: According to one embodiment, an electronic apparatus is configured to be provided with a communication line socket provided on a backside surface of a casing of the electronic apparatus, metallic terminals provided in the communication line socket, and abutment sections each of which is provided in the vicinity of the communication line socket, and is given a predetermined height from the metallic terminals in an insertion direction of the communication line socket. By virtue of the above configuration, even if it is tried to insert a wrong plug into the communication line socket by mistake, the wrong plug abuts against the abutment sections, and the insertion is stopped on the way.

Abstract: A universal power distribution system is provided for routing electrical circuits within a building structure to comprehensively provide electrical power to the building in ceiling configurations, wall-mounted configurations, raised floor configurations and in office furniture configurations. The system components for all of these configurations have common plug connectors that are engagable with each other so as to be readily usable in a wide variety of applications. The system is readily adaptable to form virtually any conventional circuit configuration found within conventional hard-wired systems yet is formed simply through the routing of the cables through the building cavities and interconnection is accomplished merely by plugging components together rather than through labor-intensive manual wiring.

Abstract: A connector includes a housing and a base. The housing has a receiving hole for receiving a first-type plug. The base is assembled with the housing and has at least one foolproof structure. The foolproof structure and the base are formed as a single piece. The foolproof structure is protruded inside the receiving hole for blocking an insertion of an incompatible plug.

Abstract: A connector assembly includes a plug connector having a base body and at least one inserting portion extended from a front of the base body. The inserting portion has a substantially circular plug groove of which an inner wall has a portion formed with an anti-mismating portion of plane shape. The anti-mismating portion has a null terminal recess for receiving a null terminal. A socket connector coupled with the plug connector defines an insulating housing having at least one receiving groove at a front surface thereof and a substantially circular receiving portion surrounded by the receiving groove. The receiving portion has a portion formed with an anti-mismating face of plane shape, corresponding to the anti-mismating portion, with a null pin recess formed thereon. A null pin is received in the null pin recess for electrically connecting with the null terminal of the plug connector.

Abstract: A connector assembly includes a plug connector having a base body and at least one inserting portion extended from a front of the base body. The inserting portion has a substantially circular plug groove of which an inner wall has a portion formed with an anti-mismating portion of plane shape. The anti-mismating portion has a null terminal recess for receiving a null terminal. A socket connector coupled with the plug connector defines an insulating housing having at least one receiving groove at a front surface thereof and a substantially circular receiving portion surrounded by the receiving groove. The receiving portion has a portion formed with an anti-mismating face of plane shape, corresponding to the anti-mismating portion, with a null pin recess formed thereon. A null pin is received in the null pin recess for electrically connecting with the null terminal of the plug connector.

Abstract: A computer system architecture in which functionally compatible electronic components are located on modular printed circuit boards. Thus, a type of processor used by the system can be changed by replacing the printed circuit board incorporating the processor. Similarly a type of peripheral bus used can be changed simply by replacing the printed circuit board containing the peripheral controller. High-density connectors connect the circuit boards. Some embodiments of the invention use a single backplane. Other embodiments place peripheral slots on a second, passive backplane.

Abstract: An extension cordset assembly includes a receptacle and a sealing gasket. The receptacle includes a receptacle main body, a receptacle connecting interface and first and second spade mating holes extending into the receptacle main body from the receptacle connecting interface. The receptacle is configured to mate with a plug having a standard spade configuration. The sealing gasket is positioned on the receptacle connecting interface and includes first and second spade openings aligned with the first and second spade mating holes, respectively. The sealing gasket is configured to provide a water-resistant seal between the receptacle and the plug.

Abstract: A connector suitable for use in relatively high current applications such as encountered in certain battery operated devices. The connector uses molded male and female connector members that include flat connector pins, the male connector pins being inserted into the female connector member to make contact with the female connector pins. The female connector member has spaces for receiving the male connector pins that have minimum gaps of less than the thickness of the male connector pin, as defined by an elastic wall of the female connector member. The elastic walls deflect on insertion of the male connector pins and maintain a force holding the male connector pins in good contact with the female connector pins.

Abstract: A connector has a dielectric housing having a base. The base has a protruding platform at a front surface thereof. A peripheral dimension of the protruding platform is smaller than that of the base. At least one connecting unit is mounted to the dielectric housing with contacts thereof extending out from both a front surface of the protruding platform and a rear surface of the base. A plastic shield is integrally molded with the dielectric housing and encloses a periphery of the dielectric housing. The plastic shield has a basic body. The basic body has a first cavity at a front thereof for receiving the protruding platform and a second cavity disposed inside the basic body and communicating with the first cavity for accommodating the base.

Abstract: Receptacles configured to securely mate with hazardous area plugs are provided. The receptacles include a housing, a locking plate, and a sliding lockout key. The sliding lockout key prevents the locking plate from rotating when the receptacle and plug are disconnected or when a standard plug is inserted into the receptacle. When the proper plug is inserted into the receptacle, the sliding key portion is depressed and allows rotation of the locking plate. Upon rotation, pins from the plug contact internal pins of the receptacle and make an electrical connection.

Abstract: RJ-45 style communications jacks include a housing having a plug receiving cavity, a guide protruding from a first surface of the housing into the plug receiving cavity and a stop provided at a second surface of the housing. The guide is configured to contact a plug housing of an RJ-11 communications plug when the RJ-11 communications plug is inserted within the plug receiving cavity so that the guide directs the RJ-11 communications plug toward the second surface where the stop prevents the RJ-11 communications plug from being fully inserted within the plug receiving cavity.

Abstract: A receptacle connector is provided for connection with a plug having two hooks. The receptacle connector includes a first tongue segment, a second tongue segment, and a housing forming an opening and two holes. The first and second tongue segments are disposed in the housing and opposite to each other. The first tongue segment includes a main body, a plurality of first contacts and two stoppers, wherein the two stoppers are located at opposite sides of the contacts and fixed to the main body. When the plug is inserted into the housing through the opening with a normal posture, the hooks are engaged in the holes. When the plug is wrongly inserted into the housing with an inverted posture (upside down), the stoppers obstruct the hooks to prevent insertion of the plug.

Abstract: An apparatus includes a multi-format memory card drive having a multi-format memory card slot configured to receive any of a plurality of memory cards having a corresponding plurality of memory card formats. At least one of the plurality of memory cards has a memory card format that is different from another memory card format of the plurality of memory card formats. A bezel is configured for installation over the multi-format memory card slot. The bezel is configured to select a subset of the plurality of memory card formats that can be received by the multi-format memory card slot of the multi-format memory card drive.

Abstract: An electrical connector/cable harness includes an electrically insulative housing and first and second passageways extending from a first end of the connector/cable harness to a second end thereof, first and second electrically conductive wires disposed in the passageways, respectively, wherein the passageways and the wires therein reverse their dispositions in the connector/cable harness such that at the second end of the connector/cable harness the two wires are disposed oppositely to their disposition at the first end of the connector/cable harness.

Abstract: An ultraviolet gas discharge lamp having contact pins extending downward from a base cap toward an opposing end. The lamp is placed within a conduit or duct for disinfecting air or water flowing within the conduit. The reverse contact pins that extend toward the opposing end mate with contact holes in a socket attached to the conduit through which the lamp is inserted. The lamp is only energized when the lamp is fully inserted into the duct and is de-energized upon removing the lamp from the duct. A shield protects the pins. A window may be place in the base cap so as to visually confirm that the lamp is energized and radiating. A key and mating receiver may be used on the base cap and the socket so as to prevent accidental insertion of an inappropriate lamp.

Abstract: An improved socket connector has flexible interior barriers to prevent incorrect insertion of smaller sized plugs, where a flexible internal barrier is formed on a side of the socket entry leading into the socket cavity, and is composed of a flexible ramp attached from the socket entry, the ramp extending into the socket cavity and having a inner movable end with a vertical barrier, sized and disposed within the socket cavity so that the insertion of a correctly sized wide plug will engage the flexible ramp, riding along and moving the flexible ramp so that the vertical barrier is moved out of a stopping position, allowing the correctly sized wide plug to be fully and properly seated in the cavity, but further sized and disposed within the socket cavity so that the insertion of an incorrectly sized narrow plug will fail to engage the ramp, will not flex the ramp, and will leave the vertical barrier in the stopping position, where it prevents the incorrectly sized narrow plug from being fully inserted into the

Abstract: A connector including a first connector element and a second connector element that are coupled into a single unit, in which the first connector element has an engagement projection that projects interior of the first connector element and extends in the direction of the depth of the first connector element so that the front end of the engagement projection is spacedly apart from the front edge of the first connector element, and the second connector element is formed with an engagement slit that extends in the direction of depth of the second connector element and engages with the engagement projection of the first connector element.

Abstract: A connector including a first connector element and a second connector element that are coupled into a single unit, in which the first connector element has an engagement projection that projects interior of the first connector element and extends in the direction of the depth of the first connector element so that the front end of the engagement projection is spacedly apart from the front edge of the first connector element, and the second connector element is formed with an engagement slit that extends in the direction of depth of the second connector element and engages with the engagement projection of the first connector element.